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MIL-~-7997C
24September1981
Superseding
MI~-M-79973
15October1973
MILITARYSPECIFICATION
.“
MOTORS,AIRCRAFTHYDRAULXC,WW’ANTDISPLACEl@TI
GENERALSPECIFICATIONFOR
,.
Thisspecificationisapprovedforuse‘bya,U””Departmentsand
*
AfjenciesoftheDepartmentofDefense.
,
..
1.
SCOPE
*
.
1.1Scope.ThisSpecificationcoverscons&antd.~splacementhydraulic
motors,generallyremotelymounted,usinghydraulicfluidunderpressure
astheener~transfermediumfordrivingvarious‘a-ccessori.es.
Hydraulic
motorsshallbesuitableforuseinaircrafthydraulicsystemsconforming
toandasdefinedin‘MIL-M-5440andMIL-H-8891”asapplic~ble.
1.2Classification.
Aircraftcons~an$d%splac~enthydraulicmotors
shallbeofthefollowingtypes
.
andclasses,&s..#ed.f+ed(see6.2):
.
..
.
...
.*9..
...
.
,.-.
.’
. RatedS“
. TypeI. -65°F(-54~c)tO
Type11.-65QF(-54C)
tO
Type
111.
-65°F(-54°C)
tO
class
1500’.1500psi(103
class3000.
3000
@ (207
class4000.4000psi(276
+l’io”p(71°c)
IIOUF(43°~)
+275°F(135°C)
225°F(1’07c)
+390°F(200°C)
350°F(178QC)
Bar)ratedinletpressure
13ar)rated%nletpressure
Bar)ratedinletpressure
CategoryA:
Secondary.Secondaryflightcontrols,winches,g-
drives,constantspeeddrives,transferpackages,etc.
CategoryB. Primary.
etc.See
endurance
Primaryfli$htcontrols,modulatingslats,
Para4.6.15forutilityandprimarymotor
testrequirements.
Beneficialcomments(recommendations,additions,deletions)andany
pertinentdatawhichmaybeofuseinimprovingthisdocumentshouldbe
addressedto:NavalAirEngineeringCenter,EngineeringSpecifications
andStandardsDepartment(Code93),Lakehurst,NJ 08733~byusingthe
self-addressedStandardizationDocumentImprovementProposal(DDForm
,1426)appearingattheendofthisdocumentorbyletter.
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